Snowmelt. If you look even further back[1] you'll see that it's cyclical. Peak runoff these days is usually March-April[2], so by May reservoirs should be max

Snowmelt. If you look even further back[1] you'll see that it's cyclical. Peak runoff these days is usually March-April[2], so by May reservoirs should be maxed out. The past few years have seen a major drought, so the curve can be pretty dramatic. 1: http://cdec.water.ca.gov/jspplot/jspPlotServlet.jsp?sensor_no=1148&end=02%2F12%2F2016+23%3A31&geom=huge&interval=720&cookies=cdec01 http://cdec.water.ca.gov/jspplot/jspPlotServlet.jsp?sensor_n... 2: http://www.abc10.com/weather/sierra-snowmelt-peaking-earlier/187931002 http://www.abc10.com/weather/sierra-snowmelt-peaking-earlier...